Mythical:

• Beimeni.
• Shangri-la.
• Cockaigne.
• Phaeton.
• Shambhala.
• Ys.
• El Dorado.
• Atlantis.
• Heaven.
• Camelot.
• Eden.

Fictional:

• Wonderland from Alice in Wonderland.
• Westeros from A Song of Ice and Fire
• Pride Rock from The Lion King.
• Hogwarts from Harry Potter.
  • Probably the most wicked place ever, literally.
• Star Wars Galaxy from Star Wars.
• Neverland from Peter Pan.
  • My top contender.
• Gilligan's Island from Gulliver's Travels.
• Narnia from Chronicles of Narnia.
• Middle Earth from Lord of the Rings.
• Cave of Wonders from Aladdin.
• Utopia from Thomas More.
• Hyrule from Zelda.
• The Wild Thornberry's RV from The Wild Thornberry.

Places that aren't super cool, but still would be cool to visit:

• Oz from Wizard of Oz.
• Gotham City from Batman.
• Springfield from The Simpsons.
• 221B Baker Street from Sherlock Holmes
• Whoville from The Grinch.
• Pemberley from Pride and Prejudice.
• The Lost World from Jurassic Park.
• Willy Wonka's Chocolate Factory from Charlie and the Chocolate Factory.
• Genovia from The Princess Diaries.
• Guilder from The Princess Bride.
• Opera House from The Phantom of the Opera.

Places I'm not sure where they are, but would be cool to visit:

• Where the Wild Things Are.
• The Brothers Grimm.
• Monty Python.
• Tarzan.
• Shrek.
• Matrix.
• Veggietales.
• Brother Bear.